online 4.0.2

📶 Library to check your Internet connectivity
Documentation 
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use std::{
    io::{Error, ErrorKind},
    time::Duration,
};

// Captive portals: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/captivePortal
pub const ADDRS: [&str; 2] = [
    // - http://clients3.google.com/generate_204
    "clients3.google.com:80",
    // - http://detectportal.firefox.com/success.txt
    "detectportal.firefox.com:80",
];

pub fn parse_timeout(timeout: u64) -> Result<Duration, Error> {
    if timeout == 0 {
        // To be consistent with the async implementation:
        // https://github.com/rust-lang/rust/blob/e51830b90afd339332892a8f20db1957d43bf086/library/std/src/sys/unix/net.rs#L142
        Err(Error::new(
            ErrorKind::InvalidInput,
            "cannot set a 0 duration timeout",
        ))
    } else {
        Ok(Duration::from_secs(timeout))
    }
}